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clarifier drive unit Articles

Clarifiers are expensive, to buy or repair, and their downtime can be costly in fines imposed by regulatory agencies and in community ill will. Regular maintenance, an annual inspection of the mechanism and an occasional touchup of the paint or coating system are simple and inexpensive proactive steps that will usually prevent most problems. Three components of all clarifiers require maintenance: ...

The Dubai Investments Park Wastewater Treatment plant in the United Arab Emirates faced challenges in their oxidation ditch due to filamentous sludge bulking, resulting in poor sludge settling in the secondary clarifier. Supplemental aeration was needed to eliminate the filamentous sludge bulking. Challenge: The oxidation ditch is treating an ...

Acid mine/rock drainage is a rampant problem in the world today. The above photo depicts acid drainage at an abandoned mine in the Yukon Territory of northwest Canada. This mine shares a similar history to thousands of other mines throughout the world. It was in operation for six short years in the 1950’s, producing gold ore. Its profitability eventually failed and it was abandoned. In the ...

On March 21, 2011, in parallel with publication of the Boiler National Emission Standard for Hazardous Air Pollutants (NESHAP) rules and the Non-Hazardous Secondary Material (NHSM) rule, EPA promulgated the final updates to the New Source Performance Standards (NSPS) and Emission Guidelines (EG) for Existing CISWI Units, collectively referred to as the “2011 CISWI Rules.”1 The 2011 ...

Determining whether the presence of nanoscale materials in chemical substances, mixtures, and articles triggers a disclosure obligation is complicated. The decision turns on a calculus that includes what law applies, what is known about the presence of nanoscale components, what knowledge standard applies, whether and how a nanoscale material is defined, and an entity’s interpretation of ...

Learning Objectives After reading this article, you should understand: Functions and processes of a decentralized PWWT system; Design considerations of a PWWT system. Overview "Clean water will be the oil of the 21st Century." The accuracy and magnitude of this statement is resonating worldwide. ...

Significant energy savings can be achieved by optimizing pump operating efficiency. Measuring the exact pump performance with crude oil under realistic conditions in the field is the first step towards improving the pump efficiency in the future. About 20 billion barrels of crude oil were transported through pipelines in 2015. Around the world, there are over one million kilometers of ...

After winning Germany’s federal elections on September 22nd, Chancellor Angela Merkel is in the middle of difficult coalition talks to form a new government. Because Merkel’s party, the Christian Democrats, did not win an absolute majority in parliament, it must find a new coalition partner. The party has begun negotiations with Social Democrats to form a grand coalition. Importantly, ...

This post was written by Lord Nicholas Stern, president of the British Academy, and Felipe Calderón, former president of Mexico and a WRI Board member. It originally appeared on Project Syndicate. This Friday, in its latest comprehensive ...

I recently presented at the 7th Product Carbon Footprint (PCF) World Forum Summit, a gathering of experts brought together by Berlin-based think tank Thema1 “to foster and facilitate international discussion on how to assess, reduce, and communicate the impact of goods and ...

This article is excerpted from 'Pure Water Handbook' published by Osmonics®, Inc. of Minnetonka, Minnesota USA and is printed with permission of Osmonics, Inc. Water treatment can be defined as any procedure or method used to alter the chemical composition or natural 'behavior' of a water supply. Water supplies are classified as either surface water or groundwater. The majority of public or ...

EPA published the highly anticipated proposed Maximum Available Control Technology (MACT) Standard for the utility sector (40 CFR 63 Subpart UUUUU). When considered together with the growing list of proposed and final rules impacting the utility sector (Transport Rule/Cross-State Rule, Coal Combustion Byproducts Rule, Cooling Water Intake Rule, Regional Haze Rule, revised National Ambient Air ...

The Rockland County (New York) Cocomposting Facility began operations in February, 1999, processing biosolids from the five publicly owned treatment works (POTWs) in the county. The Rockland County Solid Waste Management Authority (RCSWMA) owns the facility, but contracted with Waste Management of New York to design, build and operate (DBO) the 110 wet tons/day agitated bin composting facility ...

The Acta Group's (Acta) thoughts are below on what may be headed our way in 2013 from the U.S. Environmental Protection Agency's (EPA) Office of Chemical Safety and Pollution Prevention (OCSPP). Although the 2012 Presidential Election is over, environmental issues will continue to be used to make distinctions between the two parties (or between the House and Senate). Speculation is currently rife ...

The Acta Group's (Acta) thoughts are below on what may be headed our way in 2013 from the U.S. Environmental Protection Agency's (EPA) Office of Chemical Safety and Pollution Prevention (OCSPP). Although the 2012 Presidential Election is over, environmental issues will continue to be used to make distinctions between the two parties (or between the House and Senate). Speculation is currently rife ...

Bergeson & Campbell, P.C.'s (B&C) thoughts are below on what may be headed our way in 2013 from the U.S. Environmental Protection Agency's (EPA) Office of Chemical Safety and Pollution Prevention (OCSPP). Although the 2012 Presidential Election is over, environmental issues will continue to be used to make distinctions between the two parties (or between the House and Senate). Speculation ...

Bergeson & Campbell, P.C.'s (B&C) thoughts are below on what may be headed our way in 2013 from the U.S. Environmental Protection Agency's (EPA) Office of Chemical Safety and Pollution Prevention (OCSPP). Although the 2012 Presidential Election is over, environmental issues will continue to be used to make distinctions between the two parties (or between the House and Senate). Speculation ...

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